Fin



FIG. 1 is a left side elevational view thereof;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a bottom elevational view thereof; and,

FIG. 6 is a front elevational view thereof.

Any broken line illustration in the drawing is not part of the design sought to be patented. 

CLAIM I claim the ornamental design for a fin, as shown and described. 